What's Usher syndrome?
Usher syndrome is a rare autosomal recessive sensory disorder combining sensorineural hearing loss with progressive retinitis pigmentosa, and (in type 1) vestibular dysfunction. It is the most common cause of combined deaf-blindness. It is genetically heterogeneous, with at least nine genes grouped into three clinical types: type 1 has the earliest and most severe onset (profound congenital deafness, absent vestibular function, early retinitis pigmentosa); type 2 is milder; type 3 is variable. This entry confirms MYO7A, the major type 1 (USH1B) gene, as the principal driver and leaves the other Usher genes as unconfirmed scaffold. There is no cure; care is supportive, with gene therapies in development.
| Also indexed as | ORPHA:886, MONDO:0019501 |
|---|---|
| Features mapped | 16 |
| Treatments mapped | 4 |
| Published sources | 14 |
| Last reviewed | 2026-08-04 |
Signs and symptoms
Rod-cone dystrophy
The eye disease in Usher syndrome is retinitis pigmentosa, a rod-cone dystrophy in which the light-sensing cells of the retina break down over time, affecting night and side vision first.
Autosomal recessive inheritance
Usher syndrome is inherited in an autosomal recessive pattern: it develops when a child inherits a pathogenic gene change from both parents, who are usually unaffected carriers.
Absent vestibular function
The vestibular (balance) part of the inner ear behaves differently across Usher subtypes: type 3 has inconstant vestibular changes, and type 4 has no vestibular impairment.
Sensorineural hearing impairment
Sensorineural hearing loss is a core feature. In type 1 it is profound and present from birth; in type 2 it is milder and may worsen over time.
Peripheral visual field loss
Side (peripheral) vision narrows progressively, producing tunnel vision, and central vision can be affected later.
Blindness
Over many years the retinal degeneration can progress toward severe vision loss or blindness, though the rate varies between people and between Usher subtypes.
Abnormal retinal pigmentation
Retinitis pigmentosa, a progressive degeneration of the retina, is the vision component of Usher syndrome. It usually starts with night blindness and narrowing side vision and slowly advances.
Myopia
Refractive errors are part of the eye picture in Usher syndrome. In one cohort, people with USH2A variants tended to have more myopia (nearsightedness).
Visual impairment
Usher syndrome combines hearing loss with progressive vision loss from retinitis pigmentosa, and it is the most common inherited cause of combined deafness and blindness.
Nyctalopia
Night blindness (difficulty seeing in dim light) is typically the first visual symptom, reflecting early loss of the rod photoreceptors.
Cataract
Cataract, a clouding of the eye's lens, is common in Usher syndrome; in one cohort it was present in about three quarters of people examined.
Progressive visual loss
Vision loss in Usher syndrome is progressive. People typically notice night blindness first, then a narrowing of the visual field, and later a reduction in central vision.
Visual field defect
As the retinitis pigmentosa progresses, the visual field narrows, which is sometimes described as tunnel vision.
Astigmatism
Refractive errors are part of the eye picture in Usher syndrome. In one cohort, people with CDH23 variants tended to have the most astigmatism.
Abnormal vestibular function
In type 1, the balance organs of the inner ear do not work, causing vestibular dysfunction such as delayed walking in infancy and balance problems; type 2 generally spares balance.
Vestibular areflexia
In Usher syndrome type 1, the balance organs of the inner ear typically do not respond (vestibular areflexia). This appears alongside profound deafness present from birth and shows up as balance problems and a delay in learning to walk.
How it is diagnosed
Usher syndrome
Diagnosed using: Genetic testing (next-generation sequencing panel).
“…next-generation sequencing panel containing 14 genes associated with Usher…”
Usher syndrome
Diagnosed using: Electroretinography (ERG).
“…electrophysiological evaluation…”
Usher syndrome
Diagnosed using: Ophthalmologic and otorhinolaryngologic examination.
“A thorough ophthalmologic and otorhinolaryngologic examination can help guide diagnosis, which can then be confirmed with genetic studies, crucial for determining prognosis.”
Usher syndrome
Diagnosed using: Pure tone audiometry.
“…describe the vestibular phenotype of Usher syndrome type 2A (USH 2a ). STUDY DESIGN: Longitudinal, prospective, observational natural history study. PATIENTS: Patients with USH2a and USH2A -associated non-syndromic retinitis pigmentosa (nsRP). MAIN OUTCOME MEASURES: Hearing loss progression was measured by pure tone audiometry…”
Treatment and management
What the research describes, not a recommendation. Treatment decisions belong with your clinician.
This covers treatments that appear in the published research mapped here. Investigational and experimental therapies are not included, so their absence is a boundary of this map, not a sign they do not exist.
cochlear implantation
For severe-to-profound hearing loss, cochlear implantation can substantially restore useful hearing, and benefit has been seen across Usher subtypes. Early implantation is particularly important in type 1.
Used to help with: Usher syndrome.
“…cochlear implantation rescued hearing to average thresholds of 37.9 (7.0) dB HL 1 yr…”
hearing aids
Conventional hearing aids improve hearing thresholds and are part of standard care, though aided hearing still declines as the underlying hearing loss progresses.
Used to help with: Usher syndrome.
“Conventional hearing aids improved thresholds on average (SD) by 20.1 (10.9) dB HL regardless of…”
low-vision optical devices
There is no cure for the vision loss in Usher syndrome, but low-vision optical devices are part of supportive care. Along with hearing rehabilitation, they help people stay socially connected as vision declines.
Used to help with: Usher syndrome.
“Effective hearing rehabilitation measures, such as hearing implants, and visual rehabilitation measures, such as low vision optical devices, are crucial for maintaining social interaction and proper development in these patients.”
cochlear implantation
A systematic review found that many people with Usher syndrome gain better hearing after cochlear implantation, and implanting early appears to be an important factor in the benefit.
Used to help with: Usher syndrome.
“Many patients with Usher syndrome develop improved auditory outcomes after cochlear implantation with early implantation being an important factor.”
How to read the evidence labels
Where this comes from
This guide is built from 14 published source(s). Every claim above links back to one of them. Click any source ID to read the original on PubMed.
Take it further
Printed, source-linked documents built from this condition's graph — ready to bring to an appointment or attach to a coverage request. Every claim carries its published source, the same as this guide.